Chemistry MCQs for ETEA Jobs – Test Preparation Guide
Are you preparing for the ETEA Chemistry job exam? Look no further! This guide provides a comprehensive collection of MCQs, past papers, solved questions, and study materials to help you prepare effectively and enhance your chances of success. 🚀
Key Features of This Guide
✅ Latest ETEA Chemistry MCQs (Updated for 2025)✅ Pak MCQs for General Knowledge & Current Affairs
✅ Past Papers with Solutions – Learn from previous exams
✅ Syllabus Breakdown – Understand what to study
✅ Effective Study Tips – Proven strategies for scoring high
✅ Downloadable PDFs – Get past papers in one click
Which of the following gases is used in fire extinguishers?
______ گیس کو آگ بجھانے والے آلات میں استعمال کیا جاتا ہے۔
Choices:
A. Oxygen
B. Hydrogen
C. Water vapour
D. Carbon dioxide
✅ Answer: D. Carbon dioxide
📝 Explanation: Carbon dioxide is used in fire extinguishers as it displaces oxygen and smothers the fire.
Stains of rust from iron on cloth can be removed by:
______ دھبے کو لوہے سے کپڑے پر لگنے کی صورت میں دور کیا جا سکتا ہے۔
Choices:
A. Hydrogen peroxide
B. Alcohol
C. Oxalic acid
D. Petrol
✅ Answer: C. Oxalic acid
📝 Explanation: Oxalic acid dissolves iron oxide (rust) and helps in removing the stain.
Cooking gas is a mixture of which of the following two gases?
______ گیس درج ذیل میں سے دو گیسوں کا مرکب ہوتی ہے۔
Choices:
A. Methane and Carbon dioxide
B. Oxygen and Nitrogen
C. Butane and Propane
D. Oxygen and Methane
✅ Answer: C. Butane and Propane
📝 Explanation: Liquefied Petroleum Gas (LPG) mainly consists of butane and propane.
Nameplates made of brass get discoloured in air due to the presence of which gas?
______ گیس کی موجودگی کی وجہ سے پیتل کی نیم پلیٹیں ہوا میں رنگ بدلتی ہیں۔
Choices:
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen sulphide
✅ Answer: D. Hydrogen sulphide
📝 Explanation: Hydrogen sulphide reacts with brass (copper-zinc alloy) to form black tarnish.
Which of the following gases does not pollute air?
______ گیس درج ذیل میں سے فضائی آلودگی پیدا نہیں کرتی۔
Choices:
A. Carbon dioxide
B. Carbon monoxide
C. Nitrogen dioxide
D. Sulphur dioxide
✅ Answer: A. Carbon dioxide
📝 Explanation: Carbon dioxide is naturally present in the air and is not considered a pollutant under normal conditions.
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Which group of elements in the periodic table shows the highest first ionization potential?
______ عناصر کا کون سا گروپ سب سے زیادہ پہلی آئنائزیشن توانائی رکھتا ہے؟
Choices:
A. Left-hand top corner
B. Left-hand bottom corner
C. Right-hand top corner
D. Right-hand bottom corner
✅ Answer: C. Right-hand top corner
📝 Explanation: Elements in the right-hand top corner (e.g., noble gases) have the highest ionization potential due to their stable electron configurations.
When we move from left to right in the second period, the atomic volume of the elements:
______ جب ہم دوسرے دور میں بائیں سے دائیں جاتے ہیں، تو عناصر کا جوہری حجم کیا ہوتا ہے؟
Choices:
A. Increases
B. Increases with constant state
C. Decreases
D. Decreases then increases
✅ Answer: D. Decreases then increases
📝 Explanation: Atomic volume decreases initially due to increasing nuclear charge, then slightly increases at the noble gases.
The atom bomb is based on the principle of:
______ ایٹم بم کس اصول پر کام کرتا ہے؟
Choices:
A. Nuclear fusion
B. Nuclear fission
C. Radioactivity
D. Nuclear fission and fusion both
✅ Answer: B. Nuclear fission
📝 Explanation: Atomic bombs use nuclear fission, where heavy nuclei split to release immense energy.
Oxidation involves:
______ عمل تکسید میں کیا شامل ہوتا ہے؟
Choices:
A. Gain in electrons
B. Gain of hydrogen
C. Loss of electrons
D. Combustion
✅ Answer: C. Loss of electrons
📝 Explanation: Oxidation is the loss of electrons, as per the OIL RIG rule (Oxidation Is Loss, Reduction Is Gain).
Substances are radioactive if they have:
______ مادے تابکار ہوتے ہیں اگر ان میں کیا پایا جائے؟
Choices:
A. Electrons in their nuclei
B. Nuclei with fewer neutrons
C. Unstable nuclei
D. Electrons removed from the outermost shell
✅ Answer: C. Unstable nuclei
📝 Explanation: Radioactive substances have unstable nuclei that decay, emitting radiation.
Download ETEA Chemistry Past Papers PDF
For easy access to past papers, download the PDF file below:
[Download PDF Here]
By practicing past papers, you’ll learn how to manage your time effectively during the exam and understand the types of questions that typically appear.
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